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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Microchip Technology 2N2907A

Name: 2N2907A
Brand: Microchip Technology
SKU: 2N2907A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2N2907A

Manufacturer:: Microchip Technology

Category:: Single Bipolar Transistors

Package:: TO-206AA, TO-18-3 Metal Can

Description:: TRANS PNP 60V 0.6A TO-18

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2N2907A from STMicroelectronics is a silicon PNP bipolar junction transistor in TO-18 metal package, designed for high-speed saturated switching and general-purpose linear amplification. It features V_CEO = –60 V, I_C = –0.6 A, h_FE = 100 (at I_C = –10 mA), V_CE(sat) = –0.4 V (at I_C = –150 mA, I_B = –15 mA), and f_T = 200 MHz - used in discrete logic inverters, relay drivers, and low-power analog signal conditioning stages.

For engineers reviewing the 2N2907A datasheet, 2N2907A pinout, 2N2907A application, or 2N2907A equivalent, key selection considerations include its PNP polarity, TO-18 thermal resistance (R_thj-amb = 375 °C/W), saturation voltage under defined drive conditions, DC current gain at multiple collector currents, and switching timing parameters (t_d, t_r, t_s, t_f).

Technical Context

The 2N2907A operates as a medium-speed, medium-current PNP BJT with planar epitaxial construction optimized for reliable saturation in switching circuits. Its breakdown ratings (V_CEO, V_CBO, V_EBO) are symmetrically rated at –60 V, –60 V, and –5 V respectively, supporting robust operation in negative-rail bias configurations.

Switching performance is characterized by t_d = 10 ns, t_r = 40 ns, t_s = 80 ns, and t_f = 30 ns under specified pulsed test conditions (I_C = –150 mA, I_B = –15 mA), enabling use in sub-100 kHz digital logic interfaces and pulse-width modulated load control.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–60 V: Maximum allowable collector-emitter voltage with base open; defines safe operating range in common-emitter switch configurations.
I_C	–0.6 A: Continuous DC collector current rating; sets upper limit for steady-state load driving capability.
h_FE	100 @ I_C = –10 mA: DC current gain at mid-range bias; determines required base drive for target collector current.
V_CE(sat)	–0.4 V @ I_C = –150 mA, I_B = –15 mA: Low saturation voltage ensures minimal power loss and heat generation during on-state switching.
f_T	200 MHz: Transition frequency at V_CE = –20 V; indicates usable bandwidth for small-signal amplification up to ~20 MHz.
R_thj-amb	375 °C/W: Junction-to-ambient thermal resistance in TO-18 package; dictates maximum power dissipation at ambient temperature without heatsinking.

Pinout & Package

2N2907A uses the JEDEC TO-18 metal can package with hermetically sealed leads. Pin identification follows standard TO-18 orientation: viewed from bottom (lead side), pins are arranged counterclockwise as Emitter (1), Base (2), Collector (3). The metal case is electrically connected to the collector terminal.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current source terminal in PNP operation	Connected to higher potential rail in switching applications; base-emitter junction forward-biased to turn device on.
2 (Base)	Control input for minority carrier injection	Receives negative-going current to enable conduction; requires current-limiting resistor in most driver circuits.
3 (Collector)	Current sink terminal	Internally bonded to metal case; must be isolated from heatsink unless collector is referenced to chassis ground.

Key Features

Feature	Design Value
High-voltage PNP structure	V_CEO = V_CBO = –60 V enables use in –48 V telecom supplies and industrial control rails.
Low V_CE(sat)	–0.4 V at I_C/I_B = 10 ensures <100 mW dissipation in 150 mA switching loads.
Stable h_FE across bias range	h_FE ≥ 100 from 1 mA to 150 mA supports consistent gain in amplifier and switch designs.
Fast switching times	t_on = 45 ns, t_off = 100 ns allow reliable operation up to 100 kHz PWM frequencies.

Applications

Relay Driver Circuit

Digital Logic Inverter

Use Scenario: Driving electromagnetic relays requiring 100–200 mA coil current from TTL/CMOS logic outputs.

IC Role / Device Role / Timing Role: PNP switch providing active-low current sinking path to ground when base is pulled low.

Use Value: V_CE(sat) ≤ –0.4 V minimizes relay coil voltage drop, ensuring full actuation even with 5 V supply.

Use Scenario: Implementing discrete NOT gates in legacy analog-digital hybrid systems where IC-level integration is impractical.

IC Role / Device Role / Timing Role: Single-transistor inverting amplifier with resistive load, configured for rail-to-rail logic swing.

Use Value: h_FE ≥ 100 at I_C = 1 mA guarantees noise margin and stable transition thresholds across temperature.

Analog Signal Level Shifter

Low-Power Current Mirror

Use Scenario: Translating signals between –5 V and 0 V domains in mixed-supply instrumentation front-ends.

IC Role / Device Role / Timing Role: Emitter-follower configured for unity-gain level translation with inverted polarity.

Use Value: V_EBO = –5 V allows direct connection to –5 V reference without reverse-bias damage.

Use Scenario: Building matched current sources in precision op-amp bias networks or sensor excitation circuits.

IC Role / Device Role / Timing Role: Active load element in two-transistor mirror topology with emitter degeneration.

Use Value: f_T = 200 MHz ensures phase margin stability in closed-loop current feedback paths up to 2 MHz.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP switching transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PN2907	Same electrical specs but manufactured by ON Semiconductor; slightly higher V_CE(sat) (–0.5 V typical) and lower f_T (150 MHz).	Compatible in DC-coupled switches but less suitable for >50 kHz switching due to reduced bandwidth.	Select PN2907 only if sourcing diversity is required and switching frequency remains below 30 kHz.
BC557	TO-92 plastic package, lower I_C (–100 mA), higher R_thj-amb (500 °C/W), and V_CEO = –45 V.	Suitable for low-power signal switching only; not rated for relay or motor drive loads.	Choose BC557 only for space-constrained PCBs where thermal load is <100 mW and voltage stress <40 V.

Compared with PN2907 and BC557, the 2N2907A offers superior thermal performance (TO-18 metal case), higher voltage tolerance (–60 V), and faster switching - making it the preferred choice for industrial relay drivers and medium-frequency analog interface circuits where reliability and thermal headroom are critical.

Availability

2N2907A is available at Aetrix Electronics and suitable for relay drivers, discrete logic inverters, analog level shifters, and low-power current mirrors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 2N2907A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with vertical manufacturing capabilities.

The 2N2907A belongs to ST's legacy discrete bipolar transistor product line, engineered for robustness in industrial control, telecom infrastructure, and analog signal conditioning where hermetic packaging and high-voltage tolerance are essential.

FAQ

Is the 2N2907A pin-compatible with the 2N2222?

No. The 2N2907A is a PNP transistor with E-B-C pinout (TO-18), while the 2N2222 is an NPN device with E-B-C ordering but opposite polarity and complementary characteristics. Direct substitution would invert logic states and risk circuit failure without redesign.

Can the 2N2907A be used in linear amplifier configurations?

Yes - its h_FE stability across I_C = 0.1 mA to 500 mA and low distortion at moderate gains make it suitable for Class-A audio preamplifiers and sensor signal conditioning, provided V_CE is maintained above 1 V to avoid saturation.

What is the maximum safe continuous power dissipation for 2N2907A at 70°C ambient?

At T_amb = 70°C, derated power is calculated as P_D = (T_jmax – T_amb) / R_thj-amb = (175 – 70) / 375 = 0.28 W. This assumes no heatsink; actual dissipation must stay below this value to prevent junction overheating.

Does the metal case of the TO-18 package serve as an electrical terminal?

Yes - the TO-18 metal can is internally connected to the collector terminal. When mounting to a heatsink or chassis, ensure electrical isolation unless the collector node is intentionally tied to system ground or chassis potential.

2N2907A Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: TO-206AA, TO-18-3 Metal Can

Packaging:: Bulk

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 600 mA

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 1.6V @ 50mA, 500mA

Current - Collector Cutoff (Max):: 50nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 1mA, 10V

Power - Max:: 500 mW

Frequency - Transition:: -

Operating Temperature:: -65°C ~ 200°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-18

2N2907A FAQ

1.How can I place an order for 2N2907A through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N2907A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 2N2907A reliable?

The price and inventory of 2N2907A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N2907A is usually 5 days.

3.What payment methods are accepted for 2N2907A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N2907A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N2907A?

2N2907A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N2907A order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 2N2907A?

For technical support, including 2N2907A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N2907A requirements.

6.How does Aetrix verify that 2N2907A is sourced from the original manufacturer or authorized distributors?

All 2N2907A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 2N2907A meets industry standards.

7.What is the process for return or replacement of 2N2907A?

All 2N2907A units undergo pre-shipment inspection (PSI). If there is an issue with 2N2907A, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 2N2907A part is unused and in its original packaging.

Return procedure for 2N2907A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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